change expected error message from attribute to element

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@453397 13f79535-47bb-0310-9956-ffa450edef68

src/tests/junit/org/apache/tools/ant/types/AssertionsTest.java

@@ -82,7 +82,7 @@ public class AssertionsTest extends BuildFileTest {
     public void testReferenceAbuse() {
         expectBuildExceptionContaining("test-reference-abuse",
                 "reference abuse rejected",
-                "You must not specify more than one attribute when using refid");
+                "You must not specify nested elements when using refid");
     }
 
     public void testNofork() {